//standards.ieee.org/guides/bylaws/sb-bylaws.pdf>,includingthestatement"IEEEstandardsmayincludetheknownuseofpatent（s）,includingpatentapplications,providedtheIEEEreceivesassurancefromthepatentholderorapplicantwithrespecttopatentsessentialforcompliancewithbothmandatoryandoptionalportionsofthestandard."EarlydisclosuretotheWorkingGroupofpatentinformationthatmightberelevanttothestandardisessentialtoreducethepossibilityfordelaysinthedevelopmentprocessandincreasethelikelihoodthatthedraftpublicationwillbeapprovedforpublication.PleasenotifytheChairasearlyaspossible,inwrittenorelectronicform,ifpatentedtechnology（ortechnologyunderpatentapplication）mightbeincorporatedintoadraftstandardbeingdevelopedwithintheIEEE802.22WorkingGroup.Ifyouhavequestions,contacttheIEEEPatentCommitteeAdministratorat.
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1.Interference
1.1.InterferenceintoIncumbentServices
Recommendation1-1-1
Donotcauseharmfulinterferenceintotheprotectedlicensedservices.
Recommendation1-1-2
DonotallowthereceivedpowerfromaWRANdevicetransmissiontoexceed-105dBmattheinputofaDTVreceiveronaUHFTVchannel.
Recommendation1-1-3
Avoidthird-orderintermodulationproductsfromtwosignalspresentattheTVreceiver.
Recommendation1-1-4
Avoidusingchannelswhichwouldgenerateanintermodcomponentconsideringthe‘2A-B’intermodulationscenario.
Recommendation1-1-5
Applyanadditional15dBreductiontothemaximumEIRPleveloftheTPCrangeiftheCPEneedstousethechannelbecauseofthelackofotheravailablechannels.
1.2.InterferencefromIncumbentServices
Recommendation1-2-1
Acceptandbecapableoftoleratinganyandallinterferencethatiscausedbythelicensedservices.
1.3.InterferencewithotherServices
Recommendation1-3-1
Donotwillfullycauseinterferenceintootherservices.
Recommendation1-3-2
Filtertheemissionsthatareoutsideoftheintendedchannelsothattheout-of-bandsuppressionisatleast87dB.
10.Coexistence
1.1.Coexistence
1.1.1CoexistencePolicy
11.Deployment
ThissectionisintendedtobeusedasaguidebytheowneroftheWRANserviceandthesurveyorwhoselectstheareaofdeploymentfortheWRANsystem.
Recommendation3-1
PlantheWRANservicecarefullytoavoidexcessivefuturedisruption.
Recommendation3-2
Useprotectionmarginsintheserviceplanningtoavoidfutureunexpectedsituations.
3.1.CoverageandInterferencePredictionModel
Recommendation3-1-1
UseamoreprecisecoverageandinterferencemodelthantheFCCPart73coveragecurvesortheITU-RRecommendationP.1546fordeploymentplanningofWRANsystems.
3.1.1Characteristics
Recommendation3-1-1-1
UseacoverageandinterferencepredictionmodelfortheplanningofaWRANservicethatincorporatesatleastthefollowing:
∙Point-to-pointpropagationmodel.
∙Desiredtoundesiredprotectionratios（D/U）forthevariouschannelrelationshipsconsideredshouldbeselectedfromascientificreferencethatprovidesresultsfromanalysisexaminingthespecificmodulationsusedbyboththedesiredandundesiredsignals.
∙Transmittingandreceiveantennapatterncharacteristicsfortheincumbent,BS,andCPEs.
∙HeightofthetransmittingantennaAboveGroundLevel（AGL）.
∙30meterterraindata.
∙Populationfromcurrentcensusdata.
∙K-factorandotheratmosphericeffectsonsignalfading.
∙Groundcover（wetlands,desert,tropical,etc）
∙Groundclutter（trees,urbanbuildings,etc）.
∙Longtermfadingeffects,suchasthosedescribedinEnvironmentalScienceServicesAdministration（ESSA）TechnicalReportESSAResearchLaboratories79-InstituteforTelecommunicationSciences67.
∙SurfaceoftheEarthelectricalcharacteristics,suchasthosedescribedintheRecommendationITU-RP.527-3.
3.1.2Statistics
Recommendation3-1-2-1
Usethefollowingstatisticalinformationwhenperformingacoverageandinterferencepredictionanalysis:
∙802.22coveragesimulationsshoulduse99.9%timeavailability.
∙Digitaltelevision（DTV）interferenceanalysisshoulduse90%and10%fortimeavailabilityfordesiredandundesiredsignals,respectivelyand50%forlocationavailability.
∙Analoginterferenceanalysisdesiredandundesiredsignalsuse50%and10%,respectivelyfortimeavailabilityand50%forlocationavailability.
3.2.SelectionofDeploymentLocation
Recommendation3-2-1
LocateWRANdevicesoutsidethekeep-outdistancethatisbeyondco-andadjacentchannelprotectedcontoursofTVstationsthatisspecifiedbythelocalregulations.
Recommendation3-2-2
CollectspecificdatathatwouldinfluenceRFpropagation,includingthedifferenceinheightbetweentransmitterandreceiver,terrain,groundcover,andatmosphericcharacteristicsforthedeploymentareaofinterest.
Recommendation3-2-3
UsethedatacollectedinRecommendation3-2-2asinputintoaRFpropagationpredictiontoolwiththecharacteristicslistedinRecommedation3-1-1-1.
Recommendation3-2-4
Respectthegreaterkeep-outdistancebetweentheoneresultingfromRecommendation3-2-1andtheoneresultingfromRecommendation3-2-3.
Recommendation3-2-5
LocateaWRANdeviceata16mminimumdistancefromtheclosestTVreceivertoavoidcausingtabooandthird-orderintermodulationinterferencewhileoperatingonsecondadjacentchannelrelationshipsandbeyondinsidetheprotectedcontour.
Recommendation3-2-6
Avoida1dBWRANreceiverdesensitizationascausedbyahighpowerTVtransmissionbyadheringtotheminimumseparationdistancesasprovidedinthefollowingtable:
Table1:
DistancefromaDTVtransmitstation
DTVintoWRAN
Desens.
CPE
BS
Co-channel,N
1dB
406km
TBDfor75m
Adjacentchannels,N±1
1dB
91.2km
TBDfor75m
N±2andbeyond
1dB
6.6km
TBDfor75m
Note:
ITU-RRec.P.1546,1MWERPand300mHAATDTVstation
Inthecaseoftheadjacentchannel,theWRANinterferenceintoDTVreceptionmightbetheconstrainingcase.TheminimumdistanceneededtopreventDTVinterferenceintotheWRANservicemaybelessthanthedistancetotheprotectedcontourdependingontherelativeselectivityoftheWRANreceiver.Table12（missingtable）alsoindicatesthatCPEsandBSsoperatingonN+/-2andbeyondthatarelocatedtooclosetoaTVtransmittermaysufferdesensitizationfromtheout-of-bandemissionsfromtheTVtransmissions.Again,theWRANsystemplannermaydecidetoreducetheextentofhisWRANcoverageandallowhisreceiverstosuffermorethatthe1dBdesensitization.TheBSandCPEscouldthenbelocatedcloserthantheminimumdistancesgiveninTable12（missingtable）.Itislikely,however,thatconsideringtheextentoftheout-of-bandrejectionoftheDTVtransmitterinthesealternatechannels,theWRANreceiverswillbesaturatedlongbeforethisdesensitizationduetotheDTVout-of-bandsignaltakeplace.[somemorecalculationsneededhere.]
Recommendation3-2-7
KeeptheWRANpowerlevelattheinputoftheTVreceiverbelowthesaturationleveloftheTVreceiver.
Recommendation3-2-8
AvoidachannelthatisoccupiedbyPart74operation,belocatedbeyondaradiusof4kmfromthePart74receiver,orreducethemaximumTPClimitaccordingtothefollowingequation:
Tapering=Pathlossexponent*10*log（actualdistance/distanceinthetable）（dB）
where:
pathlossexponent=3.0[tbd]
12.Installation
AftertheWRANsystemplannercompletesthesuggesteddeploymentprocessdescribedaboveinSection7,theprofessionalinstallershouldfollowthesuggestionsprovidedinthissectionforaproperinstallation.ThissectionalsodescribesthecharacteristicsoftheWRANsystemdevicesthatshouldbeinstalled.The802.22standardwasdesignedwhileassumingtheWRANsystemcharacteristicsprovidedinthissection.
4.1.System
Recommendation4-1-1
ComprisetheWRANsystemofaBSandCPEs.
Recommendation4-1-2
Donotinstallequipmentwithphysicaldamageorlooseconnectors.
Recommendation4-1-3
Utilizeappropriateweatherstrippingtapetoanyconnectorthatmightbeexposedtotheoutdoorenvironment.
4.1.
4.1.1.
4.1.2.
升级会员 